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Boomlet comes from the common term of "Nooblet", a young person (usually a gamer) who is new and/or bad at the game.

The term "Boomlet" is a person who has found their way to the popular "Allies&Axis Unturned RP server" through one of MeLikeBigBooms video.
He's a boomlet, ew. Let's kick him.
by Aussie Chan March 11, 2017
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